Home › Worksheets › A Level Year 12 Physics › Particles and Radiation Prepared by Mohsim Digital Education
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The atom consists of protons, neutrons and electrons, and the proton carries a charge of +1 e, so this Year 12 sheet opens with the atomic contents and the proton charge. Leptons and annihilation releasing energy both appear in the key.
Key Takeaways
The atom consists of protons, neutrons and electrons (Q1).
The proton has charge +1 e (Q2).
Q5 records leptons among the answers.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.
The atom consists of protons, neutrons and
(a) electrons (b) quarks only (c) photons (d) neutrinos
2.
The proton has a charge of
(a) +1 e (b) −1 e (c) 0 (d) +2 e
3.
The neutron has a charge of
(a) 0 (b) +1 e (c) −1 e (d) +2 e
4.
An antiparticle has the
(a) same mass but opposite charge to its particle (b) same charge but opposite mass (c) double the mass (d) no charge
5.
Electrons are members of the family of particles called
(a) leptons (b) hadrons (c) baryons (d) quarks
6.
When a particle and its antiparticle meet, they
(a) annihilate, releasing energy (b) combine into a proton (c) reflect off each other (d) form a nucleus
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.
Name the three subatomic particles and give their charges.
8.
What is an antiparticle?
9.
What happens during annihilation?
10.
What is a lepton?
11.
What is a hadron?
12.
Give two examples of leptons.
13.
What is the charge of a positron?
14.
What is antimatter?
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.
A proton is made of two up quarks (+2/3 e) and one down quark (−1/3 e). Find the total charge of the proton.
16.
A neutron is made of two down quarks (−1/3 e) and one up quark (+2/3 e). Find the total charge of the neutron.
17.
The mass of an electron is 9.11 × 10⁻³¹ kg. Using E = mc² with c = 3 × 10⁸ m/s, find its rest energy.
18.
The mass of a proton is 1.67 × 10⁻²⁷ kg. Using E = mc² with c = 3 × 10⁸ m/s, find its rest energy.
19.
A positron has a charge of +1 e. What is the charge of an electron?
20.
An antiproton has a charge of −1 e. What charge does a proton have?
Answer Key
1. a) electrons
2. a) +1 e
3. a) 0
4. a) same mass but opposite charge to its particle
5. a) leptons
6. a) annihilate, releasing energy
7. Refer to solution guide.
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End of Worksheet
People Also Ask
What does the atom consist of?
Protons, neutrons and electrons, option (a) in this worksheet (Q1).
What is the charge of a proton?
+1 e, option (a) in this worksheet (Q2).
What happens when matter and antimatter meet?
They annihilate, releasing energy, option (a) in this worksheet (Q6).